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LBO

LBO crystal

Lithium triborate (LiB3O5) LBO is a non-linear optics crystal. It has a wide transparency range, moderately high nonlinear coupling, high damage threshold and desirable chemical and mechanical properties. This crystal is often used for second harmonic generation (SHG aka frequency doubling) of Nd:YAG lasers (1064 nm → 532 nm). LBO can be both critically and non-critically phase-matched. In the latter case the crystal has to be heated or cooled depending on the wavelength.

 

LBO Structural and Physical Properties

 

Crystal structure

 Orthorhombic, Space group Pna21, Point group mm2

Lattice parameter

a=8.4473Å, b=7.3788Å , c=5.1395Å , Z=2

Melting point

About 834

Mohs hardness

6

Density

2.47 g/cm3

Thermal conductivity

3.5W/m/K

Thermal Expansion coefficient

ax=10.8x10-5/K, ay= -8.8x10-5/K, az=3.4x10-5/K

Angle tolerance

6.54mrad-cm    (φ, Type I,1064 SHG)
7.5°C-cm   (Type II,1064 SHG)

 

LBO Specifications

 

Transmitting wavefront distortion

 less than λ/8 @ 633 nm

Dimension tolerance

(W ± 0.1 mm) x (H ± 0.1 mm) x (L + 0.5 mm/-0.1 mm) (L≥2.5mm)

(W ± 0.1 mm) x (H ± 0.1 mm) x (L + 0.1 mm/-0.1 mm) (L<2.5mm)

Clear aperture

central 90% of the diameter

Flatness

less than λ/8 @ 633 nm

Scratch/Dig code

better than 10/5 to MIL-PRF-13830B

Parallelism

better than 20 arc seconds

Perpendicularity

≤5 arc minutes

Angle tolerance

Δθ≤0.25°, ΔΦ≤0.25°

Chip

≤0.1mm

 


 
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Email: cnioptical@cnilaser.com   International Tel: +86-431-87034313   Fax:+86-431-87033597   
 
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